Thingiverse
52mm Filter Holder for a Logitech 925E Webcam by insomnike
by Thingiverse
Last crawled date: 4 years, 6 months ago
This will hold a 52mm filter (with some allowance for the outer diameter of a 52mm filter being larger than 52mm, of course) over a webcam with a flat face and a ~27mm depth. My webcam is a Logitech C925E but others should work, this isn't a very webcam-specific design.